Macroinvertabrate population structure of the Kselian River – Mazandaran
Subject Areas : New Technologies in Aquaculture Development
Keywords: Mazandaran, population structure, Keywords: Kselian River, Macroinvertabrate,
Abstract :
Abstract In this study, the population structure and assembly of Benthic in Kslyan have been studied. Kslyan is an important branch of River Talar. The total of eight stations on the river route was selected and large Benthic were sampled monthly during one year by Surber sampler with three replicates. Samples were collected with 4% formalin fixation and isolation and were counted in the laboratory. 31 families in the Great River Benthic were identified from which aquatic insect larvae were the most frequent. Persons from these three orders Diptera and Ephemeroptera and Trichoptera were the most dominant organisms in all stations. The order Diptera's frequency variation shows that many families in the two stations Chironumidae 4 and 8 had a significant increase which was due to urban pollution before entering the two stations to river. Among the orders Ephemeroptera, Baetidae and Ecdyonuridae, two families were present in all stations. The results showed that the orders Trichoptera and Hydropsychidae were the dominant family. The orders above show significant differences (p <0.001) among the stations. Results indicated that the nature has managed to compensate for the natural changes in population composition of Benthic.
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